Sample Detail of
Sample: Sample No. 91Tr09B -- USGS No. 31840-PC
Locality: Field No. 91Tr09B
Description: Howard Pass C-3. Lat. 68o 31.07' N., Long. 157o 36.05' W. Brownish-gray, fine grainstone interlayered with <50 percent black chert. Within 1-2 m of top of underlying diabase sill. Thin section is recrystallized carbonate with little relict texture--chiefly anhedral calcite crystals. (description from Dover et al., 2004, p. 37 (Table 1); [Howard Pass C-3 quad. 68°31.07', 157°36.05'. Lisburne Group, Ipnavik allochthon. Brownish-gray, fine grainstone interlayered with <50 percent black chert. Within 1-2 m of top of underlying diabase sill. Thin section indicates recrystallized carbonate with little relict texture--chiefly anhedral calcite crystals.
Exposure on north wall of tributary at camp, across end of Ipnavik ridge. Block of Ipnavik dropped down from south end of Ipnavik sequence. (description from Harris E&R report dated Sept. 17, 1993; Shipment no. A-93-11)]
Location: Alaska Quadrangle: Howard Pass C-3
Lat.: 68o31.07 ' Long.: 157o36.05 '
Reference
Title: Geologic and fossil locality maps of the west-central part of the Howard Pass Quadangle and part of the adjacent Misheguk Mountains Quadrangle, western Brooks Range, Alaska ,  2004
Report by: Jim Dover , Irv L. Tailleur , Julie A. Dumoulin
Age: Osagean (middle Osagean (late Early Mississippian))
Formation: Lisburne Group (Rim Butte unit of Lisburne Group of Dumoulin and others (1993) (Mississippian))
CAI:Min: 1.5 - Max: 2
Comment:Age: late Early Mississippian; lower half Sc. anchoralis-Do. latus Zone (middle Osagean). The species association and the redeposition of Kinderhookian conodonts is typical of the Rim Butte unit.

Biofacies: Mixed biofacies; postmortem hydraulic mixing of moderately deep water biofaces.

Shown as locality 60 on Sheet 2; map unit: Mlri

CAI=1.5-2

Sample only partly picked; conodonts abundant.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 8 Pa element fragments Bispathodus utahensis Sandberg and Gutschick All conodonts identified by A.G. Harris
2 Conodonts 2 Pa elements Doliognathus latus Branson and Mehl
3 Conodonts 1 juvenile Pa element Dollymae sp. indet.
4 Conodonts 4 Pa element fragments and juveniles Gnathodus sp. indet.
5 Conodonts 8 P elements Geniculatus sp.
6 Conodonts 24 "Hindeodella" segaformis Bischoff s.f. bar fragments
7 Conodonts 15 Pa elements Polygnathus communis Branson and Mehl
8 Conodonts 5 Pa elements Pseudopolygnathus oxypageus Lane, Sandberg, and Ziegler
9 Conodonts 20 Pa element fragments Pseudopolygnathus spp. indet.
10 Conodonts Unassigned elements: 3 robust Pb, 17 M (4 morphotypes), 2 Sa, 2 Sb (2 morphotypes), and 7 Sc (+3 morphotypes)
11 Conodonts 101 indet. bar, blade, and platform fragments
12 Vertebrates 10 ichthyoliths
13 Conodonts Redeposited Kinderhookian conodonts: 2 juvenile Pa fragments Siphonodella sp. indet.

Title: Report on Referred Fossils ,  1993 (09/17)
This report is long (1.5 years) overdue, but I have been exceedingly busy writing papers, responding to reviewers and editors comments and preparing talks. I am finally returning to a partial E&R mode and your collections were at the top of the list.
Report by: Anita G. Harris
Referred by: Irv L. Tailleur , John S. Kelley
Age: Osagean (middle Osagean)
Formation: Lisburne Group
CAI:Min: 1.5 - Max: 2
Comment:AGe: lower half anchoralis-latus Zone, middle Osagean; the species asociation and the redeposition of Kinderhookian conodonts is typical of Lisburne Group rocks of the Ipnavik allochthon. These rocks have been informally designated the Rim Butte unit by Dumoulin and others, in press (ICAM paper). The unit is of Osagean to middle Meramecian age.
Biofacies: Mixed biofacies; postmortem hydralic mixing of moderately deep water biofacies.
Thin section description by Julie A. Dumoulin.
CAI=1.5-2
Occurrence(s)
No. Group Name Qty Notes
1 Conodonts Only partly picked; conodonts abundant
2 Conodonts 8 Pa element fragments Bispathodus utahensis Sandberg and Gutschick
3 Conodonts 2 Pa elements Doliognathus latus Branson and Mehl
4 Conodonts 1 juvenile Pa element Dollymae sp.
5 Conodonts 4 Pa element fragments and juveniles Gnathodus sp. indet.
6 Conodonts 8 Pa elements Geniculatus sp.
7 Conodonts 24 "Hindeodella" segaformis Bischoff s.f. bar fragments
8 Conodonts 15 Pa elements Polygnathus communis Branson and Mehl
9 Conodonts 5 Pa elements Pseudopolygnathus oxypageus Lane, Sandberg, and Ziegler
10 Conodonts 20 Pa element fragments Pseudopolygnathus sp. indet.
11 Conodonts UNASSIGNED ELEMENTS: 3 robust Pb, 17 M (4 morphotypes), 2 Sa, 2 Sb (2 morphotypes), and Sc (+3 morphotypes)
12 Conodonts 101 indet. bar, blade, and platform fragments
13 Vertebrates 10 ichthyoliths
14 Conodonts REDEPOSITED KINDERHOOKIAN CONODONTS:
15 Conodonts 2 juvenile Pa fragments Siphonodella sp. indet.